Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e939901bcf35a2…

MALICIOUS

PDF

87.8 KB Created: 2021-08-14 13:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4903ecfaf90372b87bb7593c776a15e SHA-1: 2af43d35125412f4639466cfac9dbd446176d49c SHA-256: 50e939901bcf35a295cc3cd2045ade0ab724a97321d89c71adecc7f68d107451
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. This suggests an attempt to distribute malicious content or conduct phishing operations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://casentinoshopping.it/file/86396679957.pdf In PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/9165465898.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/6ab1b15a5ba45e4d2ef6857389af38ac/93809583162.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802e1d89208---bizexipuworabutapodo.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/qssem54s5nid1bqno93c0roql6/73474351585.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/69272107406.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/90356738868.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/knkd9qjl82f3061tg8k1rh2mpm/43254328391.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/zafitunijisoxowed.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/mulun.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/kibojo.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/31395559677.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb4c1b94c---98698898265.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/faxesuxukegetaditadepu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec2182caf1---zokiboderizokenofene.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/lowasagixotojugukozuw.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/xudogojumonojulenapi.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b47e9f1b187---kazojewo.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/duwarukuserar.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lotupobukewut.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a45e491be3b8da39840848cc5d90dba5/46753126922.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9bafd9eceec74426411410f1460f17d3/2922500105.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a38b6f0d3cb4beb0e5b5819c7c6de517/nigunivakesamamere.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/84477185467.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/u3lrp4r8ktc1fbe1flddbjl8i5/69861723805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ejercicios+de+nomenclatura+de+alcanos+alquenos+y+alquinos+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 11252 bytes
SHA-256: 8879c09e0736f0fdf6d1e859a26bf1b20e65463319f1502729e3eece60fc2860
font_01_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E9 17960 bytes
SHA-256: 3bf8be51480970869c60b2a74a4d885ab0c2a31139de8c3ab3ec64706cb60913